ANATOMICAL STRUCTURE OF ANTHROPOID APES. 191 



from it by a wide raphe. The internal female organs 

 are also like those of the human organism, with 

 only slight Tariations. Bischoff is correct in the 

 assertion that the external lips of the pudendum and 

 the mons veneris are almost wholly absent. Bolau, 

 Ehlers, and Hermes have ascertained that there is 

 a menstruation which occurs periodically, at any 



Fig. 66. — The brain of an orang, seen ftom the side (Vogt, from Gratiolet). 

 F, Frontal lobe. P, Parietal lobe. 0, Occipital lobe. R, Fissure of Kolando. 

 S, Fissure of Sylvius. C, Cerebellum. 



rate, in the case of the chimpanzee, and the other 

 species cannot be exempt from the process. At such 

 times there is a blush and enlargement of the 

 external parts, and a prolusion of the external lips of 

 the pudendum, which are at other times scarcely 

 apparent. The nymphse and the clitoris are of 

 considerable size and importance. There is often 

 an excessive enlargement and reddening of these 



